Punch, die, and press assembly



y 0- E. s. CORNELL, JR 2.199.830

PUNCH, DIE, AND PRESS ASSEMBLY Filed Jan. 24, 1939 5 Sheets-Sheet 1 lO-Zb YINVENTOR Edward S. CornelLJn fly u H1 TORNEY E. s. CORNELL, JR 2.199.830

PUNCH, DIE, AND PRESS ASSEMBLY May 7, 1940.

Filed Jan. 24, 1939 5 Shets-Sheet 2 3| 2 "I, 26%? 27 57 20-, 1 2 58 26 n 32 W V .1 Y 1 I J l% i a Zeb A $5. I z i m :l v 2 1 g l 5m 4| v 5 32a 315 60 "m as INVENTO Gla Lolwarc! 5. Cornell,

j Q Hi TORNEY 7, 1940- E. s. CORNELL, JR 2.199.830

PUNCH, DIE, AND PRESS ASSEMBLY Filed Jan. 24, 1939 5 Sheets-Sheet $5 INVENTOR EdQard S. .CorneH,Jr:

HI TORNEY y 7, 1940- E. s. CORNELL, JR 2.199.830

'PUNCH, DIE; AND PRESS ASSEMBLY Filed Jan. 24, 1959 5 Sheets-Shet 4 I 3.3.4. 45 44 4,, 5 1 4C/44b fil/ 45b. II 40b b L AM 9 4 F m1 26 so 29 1 0. 5:5 57 4525 O44CIiL 6 I, l I

INVENTOR Edward 5. Cornell Jr.

y 7, 1940- Es. CORNELL, JR 2.199.830

PUNCH, DIE, AND PRESS ASSEMBLY- Filed Jan. 24, 1939 5 Sheets-Sheet 5 lO-l 5 7 b 14a 20-1; as 55 VINVENTOR Ed 0rd 5C0 neH Jr 7 BY E 7% H15 ORNEY like fittings.

Patented May 7, 1940 UNITED sures PATENT OFFICE 2,199,830 PUNCH, ma, AND rnEss ASSEMBLY Edward S. Cornell, Jr., Larchmont, N. Y. Application January 24, 1939, Serial No. 252,514

8 Claims.

This invention relates to a novel assembly of application, Serial No. 60,171, filed January 22,

1936, and entitled Die holder. The disclosure of that application may be profitably considered in connection with the herein disclosure. There, the specific embodiment illustrated and described comprises punches, together with suitable coacting press and die arrangement, adapted to exert solely mechanical pressure, as contradistinguished from the preferred embodiment herein illustrated and described which comprises punches, together with suitable coacting press and die arrangement, adapted to exert both mechanical and hydraulic pressure in a manner considerably improved over that of the former embodiment.

In the present instance, a similar arrangement of wedge means is utilized in connection with a split die for tightly closing the sections of'the die along the line. of split and for retaining such sections of ,the die in tightly closed status during the pressure stroke of the punches operable within the die. However, a radically different punch arrangement, with press arrangement to suit, is employed. v

Apparatus, pursuant to the present invention, is primarily adapted for the shaping of hollow bodies from a material capable of plastic deformation under combined pressure of punches and a hydraulic medium, within the confines of a die. The apparatus is designed to carry out the method broadly disclosed and claimed in my copending application Serial No. 63,853, filed February 14,1936, entitled Method and means of producing wholly integral cold wrought Ts and The material particularly contemplated for fashioning by the apparatus is metal predominantly of copper content, and, in many cases, is substantially pure copper, the metal being worked in its 'cold state. The hydraulic medium employed may be water, or other substantially non-compressible fluid, but is preferably a relatively light bodied lubricating oil. Hollow bodied articles most commonly produced by the apparatus are pipe fittings of various type,

suchas T, Y, and other multiple branched configurations.

A primary object of the invention is the provision of a punch, die, and press assembly,

' away;

adapted to produce hollow bodied articles with improved operating efliciency and economy.

An object is the provision of a punch, die, and press assembly arranged so as to coact in smooth, positive, and uniform manner, ensuring long life to the operating parts.

An object is the provision of a punch, die and press assembly adapted to carry out the method disclosed in the aforementioned copending application Serial No. 63,853, in a particularly effective manner.

In accomplishing the aforesaid objects, an outstanding feature of the invention is the provision for wedging cooperation between the punches and means associated with the bed of the press to effect pressure for the forming operation.

A further feature is the provision for maintaining the split die against any material flow at the location ofsplit during exertion of the above specified pressure.

Further features and objects will be apparent hereinafter.

In the drawings, which illustrate-a preferred embodiment of the invention:

Fig. 1 represents a vertical section taken along the line l-l, Fig. 2;

- Fig. 2 represents a vertical section taken along the line 2-2, Fig. 1; r

Fig. 3 represents a vertical section similar to that of Fig. 1 but illustrating the ram in its loweredor pressure effecting, position; the view is slightly enlarged and has outer portions broken Fig. 4 represents a vertical section similar to that of Fig. 2, but taken on the line 4-4, Fig. 3; Fig. 5 represents a horizontal section taken on the line 55, Fig. 4;

I the foregoing figures.

Referring to the drawings: the press is indicated as having a bed in and a ram H, see especially Figs. 3 and 4. Its general construction may be according to accepted engineering principles for producing the pressures required to successfully operate'on the various materials capable of plastic deformation pursuant to the invention. I Formed on the bed 10 of the press, by means of slideway elements |0-| and |0-2, is a well |2 providing a slideway for the reception of a punch and die assembly, together with structure appurtenant thereto. The well I2 is formed, as hereinafter fully described, for cooperation with the punches in producing the pressures effective directly on the material within the die.

The punch and die assembly illustrated is adapted to work the raw material by a combination of mechanical pressure-exerted by the punches-and hydraulic pressure-exerted by a substantially non-compressible fluid medium. A variety of types of hollow bodied articles, and particularly those having angularly related branches, may be produced by apparatus constructed pursuant to the generic inventive concept here disclosed. The present specific embodiment of the apparatus is adapted to produce a T pipe fitting, as illustrated, per se, and indicated A, in Fig. 8. To this end, the punches, indicated at I3 and I4 may be formed with hollow tubular punch portions l3a and Ma, respectively, and head portions I31; and Nb, respectively. The material to be shaped may be alength of hollow tube having open ends, see I5.

The hollow tube of raw material I5 is preferably slipped onto a hollow tubular mandrel, as at l6, formed with an outer diameter of such dimension as to provide a close sliding fit with the inner walls of the hollow tube of material l5. The mandrel I6 is open-ended and has a port I! provided through the tubular wall thereof adjacent its mid-portion. The hollow tubular punch portions I31; and Ma of the punches I3 and I4, respectively, are substantially of the same diameter and wall thickness as the tubular material |5, and, after the tubular material l5 has been positioned on the mandrel I6, are adapted to slide over the ends of the mandrel into abutting relationship with the ends of the tubular material.

The head portions I31) and Nb of the punches l3 and M, respectively, are provided with fluid flow passages l8 and 19, respectively, opening at the upper part of the'head portions |3b and I4!) and leading downwardly through such head portions into communication with the hollows of the tubular punch portions |3a and 14a.

The punches l3 and I4, and the mandrel 6 are formed as independent elements adapted for association withthe tubular material |5'in providing a unit extending within and without the confines of a split die 20.

The split die 20 may be formed in sections 20-| and 20-2, cooperatively associated by means of dowel pins 2|, 2| and dowel receiving recesses 22, 22, see particularly Fig. 7. The individual die sections may be formed in any suitable manner to cooperatively provide a die cavity suitable for the formation of the desired article, in the present case, the T pipe fitting A, Fig. 8. As illustrated, inset portions 20-la and 20- lb, in their respective sections 20-| and 20-2 of the split die 20, may be provided to form the lateral branch 23, see Figs. 1 and 2, of the die cavity, and inset portions 20-|c, 20-Ic and 20-ld, 20-| d, in their respective sections 20| and 20-2 of the-split die 20, may be provided to form entering passages for the punch portions |3a and Ma. A plug 20-3 serves to define the outer limit of the lateral branch 23, and is held in position by its circumferential collar portion 20-3a.

Each section 20-| and 20-2 of split die 20 has portions, see 20-le and 20-lf and 20-2e and 20-22, and the extending portions 20-lf' and 20-2f, serve to seal the openings of fluid flow passages l8 and I9 of the punch heads against outward flow during the forming operation. Assuming the hollow of the mandrel and the hollows of the punches to have beenfilled with hydraulic medium in any suitable manneras by manually pouring such hydraulic medium into the openings of fluid flow passages I8 and l9-before final positioning in splitdie 20, extensions 20-le, 20-2e and 20-|f, 20-2f serve to entrap the hydraulic medium within the confines of the unit formed by the punch, mandrel, and raw material.

For maintaining the positioning of the punch, mandrel, and raw material unit with respect to the split die 20, a latch mechanism, indicated generally at 24, Figs. 1 and 6, may be employed.

The split die 20 is formed to fit between a bottom bridge element 25 and a top bridge element 26 of a die holder, the die holder being" itself arranged to be received between the bed I 0 and the ram ll of the press for vertical reciprocation into and out of the well l2.

The bridge members 25 and 26 are configurated to provide upwardly extending end walls 25a and 26b, respectively, which serve to provide a confining passage for the reception of the split die 20 and wedge members, hereinafterdescribed.

The placement of the bridge members 25 and 26 relative to each other is determined by outer wedge blocks .21 and 28, such wedge blocks being slightly greater in height than the split die 20 to facilitate positioning of the latter in the die holder. The bridge members 25 and 26 are secured to eachother, as by means of machine screws 29, 29 and 30, 30, Figs.4 and 5. Passing through suitably placedand aligned apertures in the bridge members 25 and 26, and serving to position the bridge membersrelativeto the ram II, are stripper rods 3| and 32.: These stripper rods are rigidly secured in the ram II, as for instance as shown in my copending application Ser. No. 60,171, and extend through bores in the bridge members to project downwardly into the bores 33 and 34 provided in the bed 10 of the press. The bores in the lower bridge mmber 25 have their lower portions counterbored, as at 35 and 36, above and in alignment with the bores 33 and 34, for passage of the knobbed end portions 3|a. and 32a of stripper rods 3| and 32 into abutment against the closed upper ends thereof. 3

When the ram forces the die holder down into the well l2, the stripper rods 3| and 32 are disposed as illustrated in Fig. 4, that is, depending freely within the bores 33 and 34. When the ram ll raises, the stripper rods 3| and ,32 are raised therewith until their knobbed head portions 3| a and 32a engage the closed upper ends of bores 35 and 36, whereupon the entire die holder is raised from the well I 2, see Figs. 1 and 2. l

Disposed inwardly oi the die holder next adbores, see 45 and jacent the outer wedge blocks 21 and 23, and deflningpassage for split die 23 into the holder, are inner wedge blocks 31 and 33.

The mounting for such inner wedge blocks 31 and 33 maybe ofthesprlngtype, as discloeedin my copending application Serial No. 60,171, or, if desired, the resilient mounting maybe/dispensed with. Rods 3! and 43 extend upwardly from resilient or other desired type 'of anchorage (not shown) through suitably'provided bores in the bed lb of the press and in the lower bridge member 25, see the bores 41 and 42, Fig. 3. Adjustably securedin the upper-ends of the rods 33 and 43, respectively, as by screw thread engagement, are wedge block carrying rods 43 and 44, the diameter of the greater part of their lengths, see 43a and a, being considerably reduced over the diameters of rods 39, II. The upper ends of thewedge block carrying rods are of enlarged diameter, as at 43b and b, terminating in formations, as at 43c and 0, adapted for engagement by a wrench in the operations of securing and adjusting such rods relative to the lower rods'39 and ll.

The inner wedge blocks 31' and 33 are provided with preferably centrally located bores which extend throughout the heights thereof for receiving the reduced diametered portions 43a and a, respectively, of wedge block carrying rods 43 and 44. Such rods are threaded into the upper ends of lower rods 39 and ll subsequent to the positioning of the wedge blocks thereon. a

.The upper bridge member 25 is provided with 48, Fig. 4, through which the upper portions of enlarged diameter, "band b, of carrying rods 43 and H, extend.

It is preferred that the inner wedge blocks 31 and 38 be resiliently supported. Accordingly,

' they may be provided with bores 41 and 43, and

I9 and ill, respectively, extending upwardly from the bottom faces thereof to closed-end termination in the upper portions thereof. Positioned within such bores may be coil springs '51 and 52, and 53 and 54, respectively. The coil springs are tensloned between the upper surface of lower bridge member 25 and the closed upper ends of the bores by which they are received.

whenthe ram II isinitsraisedpositionand stripper rods 3| and 32 are supporting the die holder above the well 12 of thepress, see Figs. 1 and 2, inner wedge blocks 31- and 33 rest freely on their spring mountings, and the upper ends ofrods39 and aredisposedwithin thebores ll and 42, out of contact with the inner wedge blocks. In this position, the distance between the inner faces of the inner wedge blocks 31 and 33 is slightly greater than the width of the split die 20, thus afiording free passage of the split die into the die holder.

As the ram ll descends and forces the die holder into the well l2 of the bed ll of the\ press, the die holder and 44, until the upper abut against the lower blocks 31 and 33, whereupon,

ends of inner wedge further descent of the ram H forces the die holder,'with its outer andcontained split die to the inner wedge wedge blocks 21 and 2t 23, downwardly relative blocks 31 and 33. ,Thus,wedgin action is effected against the two sections 2l-'-l and 23-2 v of split die 2I, whichaccomplishesiextremely tight closure of the line of split, between the two punches i3 and I4, and of the hydraulic me-' dium, on the raw material l5, see Figs. 3 and 4.

The forming operation is accomplished by presthe press, may be secured together by bolts, 'indicated 55, on which are strung spacers indicated 53. Recesses 51 and 58, vertically aligned with head portions I3!) and llb, respectively, of punches I3 and II, are formed in the ner margins of the slideway elements ill-l and ill-2, respectively. Inset into the recesses 51 and 53 are striker plates,59 and 60, respectively, such striker plates having their upper portions downwardly and inwardly beveled to provide guideways 53a and Ella. for cooperation with the dowhwardly wedge shaped heads I30. and Ma of the punches.

When the ram ll descends and forces the die holder into the well l2, the punches l3 and H are wedged inwardly by ative relationship between the heads I3!) and llb of the punches and the guideways 59a and 60a of the striker plates. Accordingly, the hollow tubular punch portions I31; and Ma of the punches squeeze the material of the tube I5, and, with the aid of pressure of the entrapped hydraulic force into the lateral branch recess 23 of the die, as is clearly illustrated in Fig. 3. It should be noted, that, while the punches are accomplishing their pressure operation, the sections 20-! and 20-2 of the split die are being tightly forced together by the action of the inner wedge blocks 31 i and 33, as hereinbefore explained.

Raising of the ram ll, following the pressure stroke thereof, lifts the die holder out of the well l2 by reason of the abutment of knobbed portions 3h: and 32a of stripper rods 3| and 32 against the shouldered upper ends of counterbores 35 and 36, and, coincidentally, remove the rods 39 and M from their positions supporting inner wedge blocks find 38. Accordingly, inner wedge blocks 31 and 38 drop downwardly into their normal supported position as shown in Fig. 2. The split die 20 may then be removed from the die holder for removal of the completely formed article.-

For facilitating insertion of the split die 20 into, and withdrawal of the same from, the receiving passage formed in the die holder between the inner wedge blocks 31 and 38, a slideway platform is formed at the top of slideway element Il-I in horizontal alignment with the receiving passage of the die holder.

lc-| and Ill-2, which,

Such platform is a upper inreason of the cooperportions of the material formed in part by a stationary top portion Ill-2a of the slideway element Ill-2, such stationary portion forming substantially a right angle with an upstanding slideway wall portion Ill-2b.

'Ihe remaining portion of the platform'is provided by a slide element 6| having a foot portion ila slidably mounted on a slideway bed lll2c formed at the top of slideway element lll-2. A tongue 13-241, and a parallel tongue Glb are formed on the upper surfaces of platform portions l3-2a.-and 6|a, re'spectively.- Grooves62 and G3 are formed on the bottom-surfaces of sections 2ll and 2-3-2, respectively, of split die 23 for sliding flt over the tongues Iii-2d and lb, respectively, at such times as the split die 23 is withdrawn from the receiving passage of the die holder.

ment with grooves 66 and 61 formed in the top surface ofsections 20-l and 20-4 of split die 20. Thus, split die 20 is firmly held in its position on the platfor For opening and closing the split die 20 to enable insertionand withdrawal of the unit made up of the punch, mandrel, and raw material,

, suitable mechanism such as the rack and pinion arrangement illustrated in my copending application Serial No. 60,171,- is operatively associated with slide 6|. Operation of the provided mechanism eiiects travel of slide 6| .away from slideway wall l2b, and, thus, by reason of the engagement of tongues lq-2d and Nb with grooves 62 and 63, respectively, and tongues 64a and 65a, with grooves 66 and 61, respectively, eilects corresponding travel of die section -2 away from die section 20-1. Operation of the provided mechanism in the reverse manner effects reuniting of the die sections 20-l and'20-2 subsequent to removal and replacement of the unit made up of the punch, mandrel, and raw material The specifically illustratedand described embodiment comprises two punches oppositely disposed from each other and guideways suitably formed in the well of the press for coordination therewith. It should be noted, however, that one or several punches may be employed in substantially any mutually cooperative relationship and that guideways may be provided to suit, within the generic scope of the invention.

Whereas this invention has been described with respect to a particular embodiment thereof, it is to be clearly understood that many changes may be made without departing from the generic scope of the invention as set forth herein and in the claims that follow.

I claim:

1. In combination with a press having a bed and a ram, a die holder disposed between said bed and said ram; a split die slidably mounted in said die holder; punch means operable within the recesses of said split die and having wedgeshaped head means protruding from said sp it die; guideway means associated with said bed for cooperation with said wedge-shaped head means of the punch means, during the pressure stroke of the ram, in the accomplishing of a forming operation within therecesses of said split die; movable wedge means associated with said split die; means anchored to said bed for moving said movablewedge means during the pressure stroke of said ram, and for thereby tightly closing said split die, and for retracting said movable means during the return stroke of said ram.

. 2. In combination with a press having a bed and a ram, means associated with said bed and forming a well thereon; a split die associated with said ram; means for 'retainingsaid split die tightly closed during the pressure stroke of said ram; said split die having a substantially rectilinear tubular recess and a branch recess angularly related thereto; an open ended, substantially rectilinear, hollow, tubular mandrel adapted for the reception of a length of hollow tubular material in close sliding flt thereon, and,

further, adapted for positioning within said substantlally rectilinear recess of said split die;

4 sages during the pressure punches having hollow tubular portions adapted for close sliding flt about the ends, respectively,

or said mandrel, said punches having wedgeshaped head portions which protrude from said.

split die; fluid flow passages opening at the tops of said head portions of the punches and extending into communication with the hollow tubular punch portions of the punches; a passage extending through the tubular toward the branch recess of said split die means for sealing the openings of said fluid flow pas stroke ofjsaid ram; and guideways arranged in said well for cooperation with said wedge-shaped head portions of' the punch means during the pressure stroke of the ram in the accomplishing of a forming operation within the recesses of the said split die.

3. In combination with a press having a bed and a ram, a split die associated means for retaining said split die tightly closed wall of said' mandrel with said ram;

during the pressure stroke of said ram -a hollow tubular mandrel, having a length of hollow tubular material slidably fltted about its mid-portion,

positioned within a receiving recess of said split die; punch elements having hollow tubular punch portions slidably fitted over respective endsof said mandrel with their punch ends abutting against the ends of said hollow tubular material,

said punches having wedge-shaped head portions protruding fromsaid split die and having fluid flow passages opening at the extension of said wedge-shaped head portions and communicating I with said hollow tubular punch, portions; guideways associated with said bed for cooperation with said wedge-shaped head portions of thepunches during the pressure stroke of the ram in the accomplishing of a forming operation within the recesses of the said split die; and for closing the exterior opening of said fluid flow passages during the said forming operation. V

4. In combination with a press having a bed and a ram, means associated with said bed and forming a well thereon; a die holder associated with said ram; a split die slidably mounted in said die holder; movable wedge means mounted in said die holder; means anchored exteriorly of said die holder and'extending into operative relation with said movable wedges; punch means having punch portions operable within the recesses of said split die and having wedge-shaped head portions protruding from said split die; and guideways arranged in said well for cooperation with said wedge-shaped head portions of the punch means, during the pressure stroke of the ram, in the accomplishing of a forming op-V eration within the recesses of the said split die; said means anchored exteriorly of the die holder being effective, during the pressure stroke of the ram, to actuate said wedge means in forcing the sections of said split die tightly together along the line of split.

5. In combination with a press having a-b'ed and a ram, means associated with said bedand forming a well thereon; a die holder associated with said ram; a split die slidably mounted in said die holder; movable wedge means resiliently mounted in said die holder; means anchored exteriorly of said die holder and extending into operative relation with said movable wedges} punch means having punch portions operable within the recesses of said split die and having wedge-shaped head portions protruding from said split die; and guideways arranged in said well for cooperation with said wedge-shaped head portions of the punch means, during the pressure stroke ottheramJntheaceomplishing ot-a formingoperationwithhitherecessesotthessid' splitdie; saidmeansanehored exteriorly oi'the die holder being 'eilective,"during the pressure shrokeoi'thermtoactuatesaidwedgemeansin rorcingthesectionsotsaidsplitdieti flytogetheralongthelineotsplit.

tmcombinationwithapseshavingabed andarammans aslociatedwithssidbediwm in aweilthereomadieholderassociatedwith saidram: aspiitdieslidahly mountedinsaiddie holder; movable wedge means mounted in said die holder; means anchored exteriorly at said dieholderandextendingintooperativereiation the punch means, during the pressure stroke oi the ram, in the accomplishing of a forming operation within the recesses of the said split die;

said means anchored exteriorly' oi the die holder being eflective, during the pressure stroke of the ram, to actuate said wedge means in forcing the sections 0! said split die; tightly together along the line oi split; platform means aligned with the portion of said die holder which slidably receives said split die;- means associated with said platform means for retaining one section of said split die stationary; and movable means associated with said platform means for engaging the other section oi said split die and moving it relative to the flrst'named section of the split die.

'8. In combination with a press having a bed and a ram, means associated with said ram and iorming a well thereon: a die holder articulativeiy suspended from said ram, said die holder comprising upperand lower bridge members forming a receiving e therebetween; stationary wedge means mounted adjacent opposite ends of said receiving e; movable wedge blocks cooperatively mounted, with respect to said stationary wedge means. next adjacent thereoi inwardly oi the said passage, said movable wedge blocks havingsiideway surfaceswhich deiine the lateral limits of a receiving passage tor a split die; asplit die mounted in said receiving e of said die holder; means anchored exteriorly or said die holder and .extending into operative relation with said movable .wedge blocks; punch means having punch portions operable within the recesses of said split .die. and having wedge-shaped head portions protruding from said split die; and guideways arranged in said well ior'cooperation with said wedge-shaped head portions of the punch means,-

during the pressure-stroke of them, in the aceomplishing ot a forming operationwithin the uw'v of the said split die: said means anchored exteriorly oi the die holder being eiiective. during the pressure stroke odthe ram. to

actuatesaidwedgemeansiniorcingthesectionsv oi said spiitdie fll fly together along the line of splitthereot. 'IDWARDB.QORNIIL.J:.- 

